No More Learning

So, with unusual gladness, on he hies
Through caves, and palaces of mottled ore,
Gold dome, and crystal wall, and turquois floor,
Black polish'd           of awful shade,
And, at the last, a diamond balustrade,
Leading afar past wild magnificence,
Spiral through ruggedest loopholes, and thence 600
Stretching across a void, then guiding o'er
Enormous chasms, where, all foam and roar,
Streams subterranean tease their granite beds;
Then heighten'd just above the silvery heads
Of a thousand fountains, so that he could dash
The waters with his spear; but at the splash,
Done heedlessly, those spouting columns rose
Sudden a poplar's height, and 'gan to enclose
His diamond path with fretwork, streaming round
Alive, and dazzling cool, and with a sound, 610
Haply, like dolphin tumults, when sweet shells
Welcome the float of Thetis.